/*
 * Copyright 2010 Gal Dolber.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package com.unnison.framework.junit;

import com.google.inject.MembersInjector;

import java.lang.reflect.Field;
import java.lang.reflect.Proxy;

public class ConstantInjector<I> implements MembersInjector<I> {

    private final Field field;

    public ConstantInjector(Field field) {
        field.setAccessible(true);
        this.field = field;
    }

    @Override
    public void injectMembers(I i) {
        try {
            field.set(i,
                Proxy.newProxyInstance(field.getType().getClassLoader(), new Class[] {field.getType()}, new ConstantInvocationHandler()));
        } catch (IllegalAccessException e) {
            throw new RuntimeException(e);
        }
    }
}
